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SQL Server 2012 connection strings

.NET Framework Data Provider for SQL Server

• Standard Security

  Server=myServerAddress;Database=myDataBase;User Id=myUsername;
Password=myPassword;

  SQL Server 2000SQL Server 2005SQL Server 2008SQL Server 2012SQL Server 7.0

• Trusted Connection

  Server=myServerAddress;Database=myDataBase;Trusted_Connection=True;

  SQL Server 2000SQL Server 2005SQL Server 2008SQL Server 2012SQL Server 7.0

• Connection to a SQL Server instance

  The server/instance name syntax used in the server option is the same for all SQL Server connection strings.

  Server=myServerName\myInstanceName;Database=myDataBase;User Id=myUsername;
Password=myPassword;

  SQL Server 2000SQL Server 2005SQL Server 2008SQL Server 2012SQL Server 7.0

•  

• Trusted Connection from a CE device

  A Windows CE device is most often not authenticated and logged in to a domain but it is possible to use SSPI or trusted connection and authentication from a CE device using this connection string.

  Data Source=myServerAddress;Initial Catalog=myDataBase;Integrated Security=SSPI;
User ID=myDomain\myUsername;Password=myPassword;

  Note that this will only work on a CE device.

  SQL Server 2000SQL Server 2005SQL Server 2008SQL Server 2012SQL Server 7.0

• Connect via an IP address

  Data Source=190.190.200.100,1433;Network Library=DBMSSOCN;
Initial Catalog=myDataBase;User ID=myUsername;Password=myPassword;

  DBMSSOCN=TCP/IP is how to use TCP/IP instead of Named Pipes. At the end of the Data Source is the port to use. 1433 is the default port for SQL Server. Read more here.

  SQL Server 2000SQL Server 2005SQL Server 2008SQL Server 2012SQL Server 7.0

• Enable MARS

  Server=myServerAddress;Database=myDataBase;Trusted_Connection=True;
MultipleActiveResultSets=true;

  SQL Server 2005SQL Server 2008SQL Server 2012

• Attach a database file on connect to a local SQL Server Express instance

  Server=.\SQLExpress;AttachDbFilename=C:\MyFolder\MyDataFile.mdf;Database=dbname;
Trusted_Connection=Yes;

  Why is the Database parameter needed? If the named database have already been attached, SQL Server does not reattach it. It uses the attached database as the default for the connection.

  SQL Server 2005SQL Server 2008SQL Server 2012

• Attach a database file, located in the data directory, on connect to a local SQL Server Express instance

  Server=.\SQLExpress;AttachDbFilename=|DataDirectory|mydbfile.mdf;Database=dbname;
Trusted_Connection=Yes;

  Why is the Database parameter needed? If the named database have already been attached, SQL Server does not reattach it. It uses the attached database as the default for the connection.

  SQL Server 2005SQL Server 2008SQL Server 2012

• User Instance on local SQL Server Express

  The User Instance feature is deprecated with SQL Server 2012, use the SQL Server Express LocalDB feature instead.

  SQL Server 2012

• LocalDB automatic instance

  Server=(localdb)\v11.0;Integrated Security=true;

  The first connection to LocalDB will create and start the instance, this takes some time and might cause a connection timeout failure. If this happens, wait a bit and connect again.

  SQL Server 2012

• LocalDB automatic instance with specific data file

  Server=(localdb)\v11.0;Integrated Security=true;
AttachDbFileName=C:\MyFolder\MyData.mdf;

  SQL Server 2012

• LocalDB named instance

  To create a named instance, use the SqlLocalDB.exe program. Example SqlLocalDB.exe create MyInstance and SqlLocalDB.exe start MyInstance

  Server=(localdb)\MyInstance;Integrated Security=true;

  SQL Server 2012

• LocalDB named instance via the named pipes pipe name

  The Server=(localdb) syntax is not supported by .NET framework versions before 4.0.2. However the named pipes connection will work to connect pre 4.0.2 applications to LocalDB instances.

  Server=np:\\.\pipe\LOCALDB#F365A78E\tsql\query;

  Executing SqlLocalDB.exe info MyInstance will get you (along with other info) the instance pipe name such as "np:\\.\pipe\LOCALDB#F365A78E\tsql\query".

  SQL Server 2012

• LocalDB shared instance

  Both automatic and named instances of LocalDB can be shared.

  Server=(localdb)\.\MyInstanceShare;Integrated Security=true;

  Use SqlLocalDB.exe to share or unshare an instance. For example executeSqlLocalDB.exe share "MyInstance" "MyInstanceShare" to share an instance.

  SQL Server 2012

• Database mirroring

  If you connect with ADO.NET or the SQL Native Client to a database that is being mirrored, your application can take advantage of the drivers ability to automatically redirect connections when a database mirroring failover occurs. You must specify the initial principal server and database in the connection string and the failover partner server.

  Data Source=myServerAddress;Failover Partner=myMirrorServerAddress;
Initial Catalog=myDataBase;Integrated Security=True;

  There is ofcourse many other ways to write the connection string using database mirroring, this is just one example pointing out the failover functionality. You can combine this with the other connection strings options available.

  SQL Server 2005SQL Server 2008SQL Server 2012

• Asynchronous processing

  A connection to SQL Server that allows for the issuing of async requests through ADO.NET objects.

  Server=myServerAddress;Database=myDataBase;Integrated Security=True;
Asynchronous Processing=True;

  See also the List of all SqlConnection connection string properties

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